The four-valve four-stroke engine is a strong unit. Coupled with near perfect gearing, the SMS hits 63mph and doesn’t shift from this speed unless hills comparable to Snowdon get in the way. Play the slipstream game and 70mph will appear.
Sharp-eyed, two-wheeled lusting teens will recognise the SMS engine’s silhouette being similar to the liquid-cooled lumps powering the sports Yamaha YZF-R125 and Rieju RS3. There’s a good reason for this; all three units are built by Minarelli of Italy, a Yamaha Group member. There’s no fuel injection with the SMS, just a 28mm Dell Orto carburettor. Fuelling is just as crisp but slightly thirstier with the throttle pulled back to the stop.